1.9 tdi power loss/ limp mode

[geo_855]

hey i have a problem with my Audi A4 1.9 tdi 1997 it stared to go in to limp mode or just power loss when at about 3000 rpm and using alot of diesel but when i turned it off then back on it would be ok but now its in limp mode all the time i have tried to unplug the maf but that makes no difference can any one help

[fourringsrus]

Geo , welcome to the best VAG forum available, your situation is quite common and usually points towards sticking vanes in your turbo, this can give an overboost signal and cause the car to go into safe or limp mode until restarted. Some people try to have the turbo pulled apart and cleaned thoroughly and achieve some success but usually you will be looking for a new/ recon turbo.
Worth having a vagcom ( vcds) plugged into your cars' diagnostic port to give a scan and offer you some fault codes before you open your wallet.

Stuart

[Crasher]

But unfortunately now you will have little idea if your Air Mass Meter (MAF) is at fault as you have unplugged it and now you WILL have an AMM/MAF code whether it is faulty or not…

[geo_855]

thanks guys

can any one tell me where the M.A.P sensor is i can not find it

audi a4 1.9 tdi 1997

[Crasher]

Up until production of June 97, the sensor was inside the ECU. If your ECU has a vacuum pipe going to it, this is where the sensor is.

[geo_855]

can the ecu be open and sensor changed if so is it easy to do ?

[Crasher]

I don’t think it is possible to buy the sensor, you will have to talk to a specialist ECU repairer or open it up, look at the sensor and Google the numbers you find on it.

[chris_miller]

I also had this problem and have switched to biodeiesl and the problem went away.

[geo_855]

do you think i should do a service like change fuel filter,oil filter do you think it will make a diffrence ?

[chris_miller]

Try this method for unsticking your turbo.

http://www.audi-sport.net/vb/a4-s4-f...rbo-vanes.html

As I said I have started using bio-diesel and the limp mode problem has went away.